Stereotype for chalcographic, typographic, and lithographic reproduction



UNITED STATES PATENT OFFICE.

DOMINGO MOTTA, OF GENOA, ITALY, ASSIGNOR OF TWO-THIRDS' TO EDOARDO RUGIUAND ANTONIO VILLAIN, BOTH OF GENOA, ITALY.

STEREOTYPE FOR GHALCOGRAPHIC, TYPOGRAPHIC, AND LITI-IOGRAPI-IIO REPRO-Patented Feb. 1'7, 1920.

DUCTION.

1 331 119 Specification of Letters Patent.

No Drawing. Application filed February 8, 1919. Serial No. 275,870.

To all whom it may concern:

Be it known that I, DoMrNeo Mo'rTA, subject of the King of Italy residmgat Genoa, Italy, have invented certain new and useful Improvements inand Relat1ng to Stereotypes for Chalcograplnc,Typographlc, andLithographic Reproduction, of whlch the following is a specification.

The object of the present lnvention is to obtain stereotype plates orblocks for pr1nting in the simplest possible manner both as regards thematerial (in place of copper, zinc, lithographic stone or the like) andthe artistic or industrial manipulation and the process of printing.

The problem has been solved and realized practically by means of aspecial composition which when spread on paper or other supportingsubstance is grained or rolled and should then present the followlngproperties:

l. The dimensions varying as desired;

2. Presenting a surface suitable for drawing or tracing a designthereon;

3. Being of suilicient thickness to enable the surface to be easilyengraved by means of a metal point or hard crayon;

4. Being of sufficient ductability to enable fine or thick lines orcross-hatched lines to be drawn thereon without any interstices orconfusion of lines.

5. Being adapted to typo-photographic, photo-lithographic andphoto-engravmg processes;

6. Being incombustible and insoluble either in water, alkalis or acids,and resistant to the friction of pullin.

The special composition is composed of carbonate of chalk, silicates ofmagnesia and as agglutinant. I

By way of example, the composition for applying to paper or othersupport for chalcographic and typographic stereotypes is the followingCarbonate of lime and silicate or silicates of magnesia in equal parts.These substances are suitably dissolved and agglutinated with a gum ofthe consistency of syrup, preferably of an organic nature, but this isnot essential.

Paper prepared according to the present invention and intended forchalcographic reproductions has a smooth surface and is lightly engravedwith a hard crayon or with a metal point and treated with a solution ofan ordinary spirit varnish for the purpose of hardening the surface andfor insulating the chalcographic ink.

A chalcographic stereotype replacing those of copper or zinc or othersin use at the present time can thus be obtained.

Paper prepared according to the present invention and intended to beused for typographic reproductions can have the surface eitherreticulated grained or smooth.

To obtain typographic stereotypes not necessitating depth of line in theengraving, the paper or other supporting fabric can have a network orgrain in relief on a base block having care that the height of thenetwork or grain is equal to that of the base block so that theinstrument will engrave traversing only the said grain or net work.

The design thus obtained can be utilized as a stereotype for rotarytypographic machines by attaching it on to the blank when the latter hasreceived the imprint of the characters.

For platen typographic machines it is necessary to cast the stereotypewhich is effected by inclosing the design executed on the paper in astereotype mold and afterward casting the lead as usual.

Paper prepared with a smooth surface in accordance with this inventionand intended for typographic reproductions will be engraved as hasalready been mentioned in taking care to lower the wide White margins byemploying the extra sheets as usual. After this it can be used directfor rotary machines and after casting in a stereotypic mold, for platenmachines.

Paper prepared according to the present invention and intended to servefor lithographic reproductions should be rendered insoluble by means offormaline, for instance. This paper has a smooth or slightly grainedsurface and is employed as usual with ink or lithographic chalk orsimilar means.

The typo litho chalcographic papers are subjected to all the usualmanipulations and treated in the ordinary manner.

What I claim is 1. A stereotype plate comprising a base sheet and asurface coating on said base sheet, said coating comprising carbonate oflime and silicates of magnesia in substantially equal proportions,dissolved and agglutinated With a gum.

' 2. A stereotype plate comprising a base sheet having a network orgrain in relief, and a surface coating on said base sheet, said coatingcomprising carbonate of lime and silicates of magnesia in substantiallyequal proportions, dissolved and agglutinated with a gum.

3. A stereotype plate comprising-a paper base sheet, and a surfacecoating on said base sheet, said coating comprising carbonate of limeand silicates of magnesia in substantially equal proportions, dissolvedand agglutinated. with a gum.

In testimony whereof I afiix my signature in presence of two witnesses.

DOMINGO MOTTA.

Witnesses:

G RBoNE. VINoENzo, WILLIAM P. SHOOKLEY.

